aF

emu-of-capacitance, abF

1 gigafarad

This equivalent and the others below are exact.

1 gigacoulomb / volt

1×109 second4 amperes2 / kilogram meter2

length-2 × mass-1 × time4 × electric-current2

These are the dimensions of the "capacitance" quantity in SI units. There are other unit systems used in electromagnetics that may assign different dimensions.